On the other hand , the velocity may also be increased by excavating another channel , which should be treated cautiously . ( 2 ) the change of flow rate in a typical branching rocky channel is related to excavation area scope and mode . more excavation area scope and width , more increase in flow rate ( 2 )石质汊流滩汊道分流比的变化一般与汊道的开挖面积、开挖范围以及开挖方式等因素有关，即开挖面积越大，则分流比增加越多；开挖范围越广，分流比增加越多；相同开挖面积情况下，宽浅开挖比深窄开挖对分流比的影响要大。
In order to solute the problem of diffluence mouth ' s uppityness in the underneath boundary in physics model , the dissertation adopts numerical model to calculate the area from zhuqi to baiyantan , and offer the physics model and the water level of wenshanli and kegong and the diffluence rate . at the same time , the dissertation compare the result between physics model and numerical model in different project 为了解决物模下边界分流口不易控制问题，本文同时采用数学模型进行更大范围即竹岐至白岩潭计算，将文山里、科贡水位、分流比提供给物理模型。同时，将方案计算结果与物理模型相互验证。
Though the water levels cross one section are almost equal , the velocities differ greatly . at the some cross - section , the velocity in the in the quirk may be double as that on the floodplain . the water surface will rise hi the southern branch because of the improper diffluence ratio , if using the designed diffluence col 淮河入海水道河口段水位值横向分布相差无几，而流速的横向变化较大，泓滩平均流速差最大可达一倍以上，在现有的分流口设计条件下，若按设计的南北汊分流比，南分流口有壅水现象发生，如果南汊分流增大到800m ~ 3 / s左右时，则水流较为通畅。
( 3 ) in excavation channel , the velocity in engineering area may be reduced , but the velocity in other areas of this channel may be increased and the flow condition may be deteriorated as a result of the increase of flow rate in this channel . thus , it should be discussed and studied before engineering practice ( 3 )在汊道的开挖中，工程区域的局部流速可能有所下降，但因分流比有所增加，可能导致其余部分河段的流速有所增加，恶化航行水流条件，因此在工程前需要进行充分的论证和深入的研究。
Excavating riverbeds in one channel may not only reduce the velocity area in some areas but also increase the velocity in other areas by increasing flow rate in this channel without correspondent changes in riverbeds of rocky rapids . in result , the velocity in waterway may be increased instead of be reduced , the flow condition may also be deteriorated . thus , which branch should be excavated and how to excavate in improving the flow condition of the branch should be further explored 但在分汊河道内，情况较为复杂，在一汊河道内采取开挖措施后，虽然其过水断面有所增加，局部流速相应降低，但是由于工程后，汊道的分流比将会相应变化，而石质河床一般无法通过冲淤变化以适应水流条件的改变，因此，航道内工程处的流速可能降低，也可能不降反而有所增加，恶化了航道的水流条件。
Chapter 3 gives an introduction to the flow rate dividing principle based on meter - in flow rate feedback control of multi - actuators control system . special analysis about simultaneously operating multi - actuators with different inertia loads is made . finally the results of simulation proved that the new method is an effective way to improve the flow - used ratio when the pump discharge flow rate is insufficient 第三章介绍了基于执行器进油侧流量反馈的分流控制的原理，并针对大小惯性执行器同时起动时采用该分流控制方法进行了具体分析；最后通过仿真说明该分流控制方法能在大小惯性执行器同时起动并在泵输出流量不足的情况下有效提高泵输出流量的利用率，并能实现优先级和分流比混合控制。
